How to use auto_ptr to manage objects that are no longer used in C++?

Smart pointer auto_ptr can manage objects that are no longer used and automatically clear them to avoid memory leaks. Here's how it works: auto_ptr stores objects in pointers. When auto_ptr goes out of scope or is set to nullptr, it calls the destructor of the pointed object, freeing the memory. Can be used to create temporary objects or release useless objects to avoid memory leaks.

Use auto_ptr to manage objects no longer used in C++

Introduction
auto_ptr is C++ A smart pointer used to manage objects that are no longer used and automatically clear them. It provides a simple and effective way to avoid memory leaks.

How it works
auto_ptr stores objects in pointers. When an auto_ptr object goes out of scope or is set to nullptr, it automatically calls the destructor of the object it points to, freeing the memory.

Code Example

#include <memory>

int main() {
  // 使用 auto_ptr 创建一个对象
  std::auto_ptr<int> ptr(new int);

  // 使用指向对象
  *ptr = 10;

  // 出作用域时自动释放内存
}

Use Case

One of the most common uses of automatic pointers is to manage temporary objects or no longer The object used. For example:

Creating a temporary object

std::auto_ptr<std::string> str(new std::string("Hello world"));

In this example, str points to a std::string object that contains the string "Hello world". When str goes out of scope, the std::string object will be automatically released.

Release useless objects

void foo() {
  std::auto_ptr<int> ptr(new int);
  
  // ...

  // 不再需要对象时释放它
  ptr.reset(nullptr);
}

In this example, ptr is set to nullptr, causing the pointed object to be released.

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